// The MIT License (MIT)
//
// Copyright (c) 2019 Hellobike Group
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.

#import "ThrioRegistrySet.h"

NS_ASSUME_NONNULL_BEGIN

@interface ThrioRegistrySet ()

@property (nonatomic, strong) NSMutableSet *sets;

@end

@implementation ThrioRegistrySet

+ (instancetype)set {
    return [[self alloc] init];
}

- (instancetype)init {
    self = [super init];
    if (self) {
        _sets = [NSMutableSet set];
    }
    return self;
}

- (ThrioVoidCallback)registry:(id)value {
    NSAssert(value, @"value must not be null.");

    [_sets addObject:value];

    __weak typeof(self) weakself = self;
    return ^{
               __strong typeof(weakself) strongSelf = weakself;

               [strongSelf.sets removeObject:value];
    };
}

- (ThrioVoidCallback)registryAll:(NSSet *)values {
    NSAssert(values || values.count < 1, @"values must not be null or empty.");

    [_sets unionSet:values];

    __weak typeof(self) weakself = self;
    return ^{
               __strong typeof(weakself) strongSelf = weakself;
               [strongSelf.sets minusSet:values];
    };
}

- (void)clear {
    [_sets removeAllObjects];
}

- (NSUInteger)countByEnumeratingWithState:(NSFastEnumerationState *)enumerationState
                                  objects:(id __unsafe_unretained _Nullable [])buffer
                                    count:(NSUInteger)len {
    return [_sets countByEnumeratingWithState:enumerationState
                                      objects:buffer
                                        count:len];
}

- (id)copy {
    ThrioRegistrySet *set = [ThrioRegistrySet set];
    set.sets = [self.sets mutableCopy];
    return set;
}

@end

NS_ASSUME_NONNULL_END
